When a webservice is invoked from the application running in WASv126.96.36.199, if the below error is being seen.
org.omg.CORBA.portable.UnknownException: vmcid: 0x0 minor code: 0 completed: Maybe
java.lang.NoSuchMethodError: com.ibm.ws.webservices.engine.description.ParameterDesc: method
This is because of the version of the jar files used - webservices.jar and wsdl4j.jar. Check the versions being used in the app server lib folder. And replace with the right versions containing the above definition of method.
ParameterDesc is a class inside webservices.jar and has a constructor with 8 arguements, which is not found in the above case.
Also, the QName is referred to javax.xml.namespace package instead of appropriate package as defined in wsdl4j.jar. As it is not able to resolve the right package, defaults to javax package for QName.
Hope this helps.